You can control the sensitivity of the triggers on the elite controller. Not sure if you can with the bumpers. You could always map the bumpers to the pads on the back. Not sure how much difference in noise it would make.

Practise trying to get used to right stick switching maybe, I'm getting much more used to it recently because the clicking on LB does my head in. Right stick is more responsive and you can choose the actual right player you want rather than search around with the LB for 10 seconds clicking away